POV-Ray : Newsgroups : povray.newusers : Non-touching objects seem to be touching : Re: Non-touching objects seem to be touching Server Time
16 Apr 2024 07:02:44 EDT (-0400)
  Re: Non-touching objects seem to be touching  
From: Nicki
Date: 10 Feb 2017 11:15:00
Message: <web.589de6eaccd1a85e5e1b0d740@news.povray.org>
> What you're seeing is a long-standing problem known as "[near]
> coincident surfaces": If POV-Ray encounters one transparent or
> semi-transparent surface, the ray traced from there onward will ignore
> any surface within a particular distance.
> The rationale for this behaviour is that the ray can't erroneously
> re-encounter the transparent surface (or any surface truly coinciding
> with it) again, which could happen due to rounding errors, and might
> lead to a potentially infinite loop.
> As a consequence, you need to make sure that you leave a bit of a gap
> between any transparent or semi-transparent objects and adjacent objects.
> Since the required minimum distance is a constant, scaling up the entire
> scene allows you to get away with a smaller /relative/ distance.

Thank you very much for the quick help. Your explanation is most helpful and
comprehensible. And scaling everything up seems like a very reasonable solution.

I am sorry for having posted a recurring problem, my initial search didn't yield
any results.

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